CVE-2026-44195 OPNsense: Authentication lockout bypass
An unauthenticated attacker can bypass authentication lockout mechanisms in OPNsense by injecting crafted usernames, allowing continued brute-force attempts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44195?
CVE-2026-44195 is a medium-severity vulnerability in opnsense core, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.
Weakness: CWE-307
Which versions are affected by CVE-2026-44195?
It affects 1 product.
Products include Opnsense Opnsense.
How do I fix CVE-2026-44195?
No fix has been published for CVE-2026-44195 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-44195 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44195 exists.
Other vulnerabilities in opnsense core
Sources
Also known as GHSA-h3vx-4q27-rc42.